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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b748c432c682c467ff0b2614860ebb1eea9c5fa06e508e64fbe74d31610767' 
  AND token = 'qk6NmvMufiIlv+mqvoUXNFq6sptECrhm0M7tnSKzBBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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