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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c0c1bd30d46f4a9a9a9875c3ce249f69ba936d11c87989e7ab3010fc15592d' 
  AND token = '9PaV0aYirL4PTT3CSo/8G1wPbIQlLvl9sEdbnRIKbwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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