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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8fbe9ebb5d388c1398a24c253180ca71138d69185fc162bc6ab6b593868f332' 
  AND token = 'gy0VQ054LevhQRoWt/Ux7w2+zOMrn48eVCCQli35TQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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