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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd9b31c61805b2f5e3dec90e6c6b0fb435d463165a63f44a617f355122fb8c8' 
  AND token = 'aOxUc2UO6Zworb6inDVfdntuxx10LkAZG9GAqORJCFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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