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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d1d68fcdbed21058e4632883ea7ed669e2f0e2487428643580b722335731ab' 
  AND token = 'l85oV4P95kjOiNEJZ3LVEnqvTVA988aeuUsmjSUs8tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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