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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0d7a3c7ab43207dc06d846b2fe0f8d0466773db930aba4b7f865b8e34ae632' 
  AND token = 'z5vnKAca3NZ8oMfI5tht0DnHMjJPAXoZaPMw03quABw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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