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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9dc24334151c3070938f19e0c3139d987235b64f7df4b1e91d3beeefa7a6d34' 
  AND token = 'NTgbR+e4E3yrYjcnj+dI6RkPZib0gIwctu9wOPxnIYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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