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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e932dca0f8fc0d1980827ac5a455d466fd4e2d29f78d52be524604ee4435c36' 
  AND token = 'paCIhAO9JMX+647smDbEVG0gHCG7a7Z+2G7hcFaxNmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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