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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07109416efbfd62d8016bfdb02f71d3b6274ef1e2d6c8dbb1a3f2d12401ea4b0' 
  AND token = '2rSTRX+SL26UUB7S7dZ83mxAT8z0Z1pPE/rw+ceRS+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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