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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43f2eeb25cedc7f67acd615831e098365bd6169e2c6e710539bc00ac9609f4df' 
  AND token = 'j1dSZVNR947LcdfjzLXE6UeFwTK8sy+ToT0eT2lmtQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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