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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62bb5d68d4c2947e587f35fb81507dede41aa8fcff0bde7b7ead572618b3cf6e' 
  AND token = 'X97wmMwUSkhSG1zCA//m4dy9VgAjYxYzWUsa9Q17/2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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