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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b055c9c1935bc9b6144d3b0d6c4783126d570266e1a4e8ce121e1f48921fa84' 
  AND token = 'kLP1t+bhtJcQouUEj2tp5Us4Fvbd7Rgqlp0guJ5fwjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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