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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe34fa0a1974206ef035eeacfec8fe5799714e5bda67ce602dbf4a8e49321ca0' 
  AND token = 'Yhbff2YJKUn5P58dzW81WZKYwuJq1NgvwtqoyF5gYfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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