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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4552615547d0dd089ac2be42a2e880314658a4110e2994e83fbf5a79bee2b34' 
  AND token = 'x+uTnyIt43/JlhEtUp+HhvXcWYkXF3/hihGl57s73G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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