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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0646d64c6cb68ade1870e783be5fe01878ed41659a0e2b1ab9673a98a0256f56' 
  AND token = 'V0Dui6jhpNBHa5j3rN72loLMnvr7yVompucUZM0gu74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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