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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9e8f7a3e44eb183e157ade5541dd9dd1185794154e67ad1a3eb4bae6afb5e2' 
  AND token = 'In2vtFAmvX09GdRZCZ50WXX2EFQFWY98lLwb+sta1iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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