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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd93945ee6d69aca2da8d08030ce260f1c6b029f17a843bc02ac2b2e44aafd2' 
  AND token = 'Lo4KUsWXEmAwOfhcDX19key09UZ73sjAonnnDhr8vtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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