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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c74c0e51ab1a93305fe0c60e87d5cfd1ffef4e78bffb3e26d5ed42b571af5a' 
  AND token = 'sgargeD8VJthS42DHfIslDTBvfMYkAX3TLgFaH5azVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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