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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515cbfc24c203af9ac19cba29c4ec4c9f25a8c7f291eaa739f5b1a84e3fc32f5' 
  AND token = 'hrVRkGV3jHFTi0PFjiEWmXm/5ZSrQAT4rWDlbFlQVCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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