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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb257ba6740526118befe16cca0619e431c1a9b304b38ed13c4a06606e53139e' 
  AND token = 'TE9/HkZ9RsjFAsj6h9gY0hnAQ/Bwc2DVghQfaRDSRoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}