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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4e0dd0cbcd1332b072788f6fb3777318d017a85a2b69c1e779bc06499bcd9a' 
  AND token = '9G+GKQYdS6SBGAFU4G7icxkWp63DrAz27foj759xjHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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