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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d52fb5c274be5b89a072c64c215b4d7b7752ff8ad53bbc74f1a17c2a319021f' 
  AND token = '1f+M1ZdTTbSm42fYmttEDcXqH/gGkWymlOYGmgOHXUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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