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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41da6d81b68591eb2544c45c7cf4f10bafb14988b81fc46c96363d03ea0bbc6' 
  AND token = 'qqTz6ovbedBIuq01ziLn6ymJkIVr6jEvGncW24jcXSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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