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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c734aace028ce23638935b5c32d263d04c3074ab46e6dce13c854f4f92789ea' 
  AND token = 'vfLPVOmF6k9ct1Up47XUAzwbu4Qu+/nCCx+XOFpBfb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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