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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70cb7e8f5bf9f70ec98a980e0be5aa28b8e93835843276988fb08046340d475' 
  AND token = 'M/bRBMhnLmpc6WnpJePPw8uEmZ03+7+z6XCcw3oFB5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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