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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a16c41e01ce90fd5c7c4546d74b9884b13c08aa4f905a40dc6e5aa945ebd82' 
  AND token = 'yJnSKwel9UJRwwVR58eM5s7KBBg68GVpPKWgaVAGsKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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