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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fc92824c574fad154dfd9b8a9f8807b10a789da9d951ce8754d92665514fdc' 
  AND token = 'pK4VmSBsZiMNGoxINoZFd47XUsj26RPd5kO/mAveywQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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