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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0848d97af4b2359d487a0256e2735606aedd99b4de31af7933fd559f1626c0b3' 
  AND token = 'pE9uvQq+6+uJcuH1ViLouuYa2WnM3eL4nJklEQh87MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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