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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c0703f51019ab23958f819ede711551da8736ff32ab846fcfc7eff9269c535f' 
  AND token = 'fsVdV701Md1PMfwp2lBJjeBBHXC+iFVz4Jb2G1sEzaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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