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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a7cd889c8768a0a7ce0aca243064f0dc90f98bbaf9bafbc735da977efc974ec' 
  AND token = 'RAmbPHFWgDwP7AFdwr2AUZU69NzB//T7Zhu/BBpVyyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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