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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe2d04787afd6706440d88c58bb4139868119f1666a30fd77e4c5187a540bf0' 
  AND token = '1DaexgYBXfwednpyLSLl42VgAPd1yQ2LHtF+Is69r4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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