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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74091b8be4e2e619fe213f9da81f3d4c4d56c28d39460464e9b980ab53a8ab8d' 
  AND token = 'R93KwMBXXnmCn+ZH4z03QyC6onvzAh30yskRKd1nq1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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