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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad8dde63ef5f0be6e0ded15a5241eabb27d88315695a0be28494181b306b138' 
  AND token = 'vnQMwin4m63QWc+DqXgXil1NBl3kMm8fLijKLA/Sigc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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