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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e12715b4c7bd0080932dbd0fc09476bc11817c2100227f277ceb9035fb9e2d2' 
  AND token = 'k9JC3PD1hQtMRkctKkwOJ/42TCj8PT79zKFo+5frtWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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