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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '277bfcc1ed6356980e7b02db97e06c88cfd5ffd2806e358d9eb7e7fc9bb5865a' 
  AND token = 'YWga9kQ7cv7G4Axy5Cg5MY1d+CRNi3rN6AF4xllYmuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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