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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae76bcc9034e7e03fa20681875f8dd43459139fed1fa3e07fc847b37af72faa' 
  AND token = '5SNp1UfFqUCAjbFMAIvi5SDwyWlnJV8iTZ7GKqP0pJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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