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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69561738db3162d83a6053a2d708564f60b6b7f075af817a64d4f522f947d594' 
  AND token = 'zp7Em4n5JfzWY77MeZFMkO3dEXJH7XQHUa2CZpc1pyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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