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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2f829a0e1b58c7e440d1fd39a1c1725acdfe5852f2134713095457b66fee7d' 
  AND token = 'Ea8740dCzPyufLe/Gta6qAG35CbanueZAX4RVdPmnGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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