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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f26decbc042cb72bc726cd947c3974d64f6fedef142fc120a1df4c6e3a6c464' 
  AND token = 'TaeZSIPoArn6WeUivcuYDGR7sAQYEf97XNFG64PH5Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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