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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5bb633adb4b700d945c1ea43907cc6cb59c74b2f6fb448ce79852078157612f' 
  AND token = 'OKrELRhy0Mkotz+o73HdxhEqY+acF4Op93WUSKxclTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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