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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e3c272e6f5678a6fa0d777f014066d03430b86de9e8a27f8610ab4d9b7bda2' 
  AND token = 'dIzzTAj1cvbemS5liK3NzDP2oeITVGNRdWLqcy0at44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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