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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af2042a1826eb75014bb584ee30d873bf2a9af66077bed05f4e3d9bdc57db25' 
  AND token = '1ihyhyNyFvWbG8NIu80ntr40jRpxr3I3OP0I894uUWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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