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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db03ffde7d918cf00cc7406561d5e6e70262aa0adf941e29baa189875204ff5' 
  AND token = '4bwMBOqq6FNLFrjf0Lofo8YOLnXW3QyvdDRZuKIWJIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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