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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91373d64596c7556e745759f62def1c71186e9acb8e836aebcb83cfc727da42c' 
  AND token = 'YejXf5HCIQEmlFAXhY6LiOEJEmeFKnxKKR3tZA4ite0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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