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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3407759b4260a0804fdad7b0808e2e82c10e07fde249d03fd8be3d7b1b7c22a' 
  AND token = 'rYYE419D4qK40pFoMCd9T3xeplCeZPheJT9LNee598Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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