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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f9b00313716b4863126ace93eba1b57a19681beb98812c21a67d4ec611458e' 
  AND token = 'gNQyrtImkf6war8kRhOrm/1KwxpPR6xE8kNbB6SwVcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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