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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6280ecfbe126eb07b6928a5b4c30e9e7bdec9a186990fbb557f73cebd8ec183' 
  AND token = 'sNDiJaYdeAUDvtBgUk+GFU29OXH8TybfKs4NjrdoMeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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