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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f2a803ce6649610849e2c1700620e53b7c1dd955d75384c276c81d3cb8df19' 
  AND token = 'ehLPdNWcHsX73wrwkTtP1//hL67hcNkFmEG9x5rGLDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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