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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cd970e24cadfe37c62362b9ef43c13ec5f3bd85d943eac42790e16f53b7652' 
  AND token = 'NYhCgqC4NbwX7B8Hiim2Xebg6kboJA5IB2O90bn39mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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