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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990abba2444ad1ef4dcf3a9c3136c27f2da5a961b1d74f8a723d17fde82348bb' 
  AND token = 'iiaL6cAs/68VXdjTlFbircZ/Hv/HC3UGpHR5l/G8n7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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