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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d1ecaff5a5b7209b3fd90fe22a23c752734d9e0d4e0e51a2f036c4cb48492d3' 
  AND token = 'KuuscxxoxvqUDymFldhn4ih77BwLTEH71Ktq2mjS8wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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