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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee499467d48fb2ca5a5f4d4a3748dbfa37ed5e18f1ec5b58a6f5eee92b6f4cb' 
  AND token = '3boG8U5r/WSwUf3oX1uzkWrHlSMy5MyPtN5x3LO6l+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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