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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61fa407cf086d9328cfcfcb502e29a85e4d42d603f4bd014ea2b4d84537e758f' 
  AND token = 'DcjMdkgf14nd9YnKPRTRL5gIblVSREAxd88fNSGP30o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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