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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6e16044e4a329df14e3e95e99721b832def8d81455c155b63ea5b15668746e' 
  AND token = 'HZqpk24t6W8e8Pgt60H1EJBVXcK7DRjbmvaf8049NMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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