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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ee7e0c60c099c89445332b288dab4b9e961d2f895512068806cf5d8e1ec756' 
  AND token = 'DW+qqvivtzkuEqiAUrzfbxJUcSsGZaUSIgjP5R62HcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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