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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd64e14bbde3c3e7888a08d674fd15277463d6ef9c9b045117064545d934e776' 
  AND token = 'pqGzXxzeJWNknRSN1vzOqpwONlWwAP4Th8Sg3gIIWBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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