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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '721c0c38663e8af7ab2e9e7d3de2df373ca563ca5ffafd1d80a5070aff6a34be' 
  AND token = 'eu5pyr1CC6qovzrA5NYty0ZcoKrPCX0tEpbY29ychv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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