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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c3e21bd9d3d8a2e80ca321ecb90642be14e368f1cfff75c6c6304b7f7b87f10' 
  AND token = 'JW/W4zUJxLS512qF2pk1sjVPUY/qringirY1xrC9Qr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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