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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e4a0e9318e3d8faf69333579085b08ff78be2918c6541240beaaaaccab4f8d' 
  AND token = 'e2Hy3ttVC6Byz9McrkMPiCqGcJ/HjeFjAnEO/H+95D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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