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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c81fc5c2b9081ceb807c7ba936dd8d7d1be905668532a2ab8bbb47da3d9b0c' 
  AND token = '2M7WGcXs2gJRB+iDg9c0JLMU9l5C+N7cad/ykWKIPLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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