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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b615a2136a2070b622b1db25f9944cf5cb4a0aba1683faf38260bd270abff0' 
  AND token = 'gEDaLqtAiK7YCIw55gRGtd3MGlu6Jr5iT67AcBUmr2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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