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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059c5534d5f544827cec282b27cf4219438604ffdc927063d8d5df5ab0e897fc' 
  AND token = 'PN22Uwytv+mqmpYk9UVYTF7HAWjD2XKE8Am9f32nQAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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