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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae6350f987bd1cc1f4f2190b5efc9f40e39a3df1d344e5eb62b3a46b65082b7' 
  AND token = 'Pj3MMW79MMX+x/ULhC4V+/WStJV/QHXePif2jpde4e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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