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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e6c90670d6c21b3ca70ac77debb57dd52e945577d7844dbc80b09bd5dc9ad86' 
  AND token = 'vK9/PJ95DWauqRDCvbPc6uEW2RO8asKXE0/xrFtO5do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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